A new report can describe an older period
A dataset released this year may summarize observations collected several years earlier. A pooled estimate may cover an extended period. Labeling it only with the release year makes it look more current than it is.
Conversely, an older source may still describe a relatively stable feature accurately enough for a particular planning task.
Ask what could have changed
| Decision | Recency concern |
|---|---|
| Long-term infrastructure planning | Broad patterns and population change |
| Response to a recent disruption | Current service availability and urgent needs |
| Program targeting | Whether the eligible population still matches the estimate |
The acceptable lag differs across these uses.
Combine sources carefully
Recent interviews or operational data can add context to older population estimates. They do not automatically update the population percentage. Keep the roles separate: one source estimates prevalence for its period; another describes more recent experiences or service conditions.
Put dates beside the finding
State the reference period, release date when relevant, and known changes since collection. If evidence is insufficient for a time-sensitive decision, targeted new collection may be warranted.
The aim is not always the newest possible number. It is information whose timing is appropriate to the decision and whose age is visible to the reader.
